xref: /openbmc/linux/fs/nfs/nfs2xdr.c (revision 6650239a)
1 /*
2  * linux/fs/nfs/nfs2xdr.c
3  *
4  * XDR functions to encode/decode NFS RPC arguments and results.
5  *
6  * Copyright (C) 1992, 1993, 1994  Rick Sladkey
7  * Copyright (C) 1996 Olaf Kirch
8  * 04 Aug 1998  Ion Badulescu <ionut@cs.columbia.edu>
9  * 		FIFO's need special handling in NFSv2
10  */
11 
12 #include <linux/param.h>
13 #include <linux/time.h>
14 #include <linux/mm.h>
15 #include <linux/errno.h>
16 #include <linux/string.h>
17 #include <linux/in.h>
18 #include <linux/pagemap.h>
19 #include <linux/proc_fs.h>
20 #include <linux/sunrpc/clnt.h>
21 #include <linux/nfs.h>
22 #include <linux/nfs2.h>
23 #include <linux/nfs_fs.h>
24 #include "internal.h"
25 
26 #define NFSDBG_FACILITY		NFSDBG_XDR
27 
28 /* Mapping from NFS error code to "errno" error code. */
29 #define errno_NFSERR_IO		EIO
30 
31 /*
32  * Declare the space requirements for NFS arguments and replies as
33  * number of 32bit-words
34  */
35 #define NFS_fhandle_sz		(8)
36 #define NFS_sattr_sz		(8)
37 #define NFS_filename_sz		(1+(NFS2_MAXNAMLEN>>2))
38 #define NFS_path_sz		(1+(NFS2_MAXPATHLEN>>2))
39 #define NFS_fattr_sz		(17)
40 #define NFS_info_sz		(5)
41 #define NFS_entry_sz		(NFS_filename_sz+3)
42 
43 #define NFS_diropargs_sz	(NFS_fhandle_sz+NFS_filename_sz)
44 #define NFS_removeargs_sz	(NFS_fhandle_sz+NFS_filename_sz)
45 #define NFS_sattrargs_sz	(NFS_fhandle_sz+NFS_sattr_sz)
46 #define NFS_readlinkargs_sz	(NFS_fhandle_sz)
47 #define NFS_readargs_sz		(NFS_fhandle_sz+3)
48 #define NFS_writeargs_sz	(NFS_fhandle_sz+4)
49 #define NFS_createargs_sz	(NFS_diropargs_sz+NFS_sattr_sz)
50 #define NFS_renameargs_sz	(NFS_diropargs_sz+NFS_diropargs_sz)
51 #define NFS_linkargs_sz		(NFS_fhandle_sz+NFS_diropargs_sz)
52 #define NFS_symlinkargs_sz	(NFS_diropargs_sz+1+NFS_sattr_sz)
53 #define NFS_readdirargs_sz	(NFS_fhandle_sz+2)
54 
55 #define NFS_attrstat_sz		(1+NFS_fattr_sz)
56 #define NFS_diropres_sz		(1+NFS_fhandle_sz+NFS_fattr_sz)
57 #define NFS_readlinkres_sz	(2)
58 #define NFS_readres_sz		(1+NFS_fattr_sz+1)
59 #define NFS_writeres_sz         (NFS_attrstat_sz)
60 #define NFS_stat_sz		(1)
61 #define NFS_readdirres_sz	(1)
62 #define NFS_statfsres_sz	(1+NFS_info_sz)
63 
64 /*
65  * Common NFS XDR functions as inlines
66  */
67 static inline __be32 *
68 xdr_encode_fhandle(__be32 *p, const struct nfs_fh *fhandle)
69 {
70 	memcpy(p, fhandle->data, NFS2_FHSIZE);
71 	return p + XDR_QUADLEN(NFS2_FHSIZE);
72 }
73 
74 static inline __be32 *
75 xdr_decode_fhandle(__be32 *p, struct nfs_fh *fhandle)
76 {
77 	/* NFSv2 handles have a fixed length */
78 	fhandle->size = NFS2_FHSIZE;
79 	memcpy(fhandle->data, p, NFS2_FHSIZE);
80 	return p + XDR_QUADLEN(NFS2_FHSIZE);
81 }
82 
83 static inline __be32*
84 xdr_encode_time(__be32 *p, struct timespec *timep)
85 {
86 	*p++ = htonl(timep->tv_sec);
87 	/* Convert nanoseconds into microseconds */
88 	*p++ = htonl(timep->tv_nsec ? timep->tv_nsec / 1000 : 0);
89 	return p;
90 }
91 
92 static inline __be32*
93 xdr_encode_current_server_time(__be32 *p, struct timespec *timep)
94 {
95 	/*
96 	 * Passing the invalid value useconds=1000000 is a
97 	 * Sun convention for "set to current server time".
98 	 * It's needed to make permissions checks for the
99 	 * "touch" program across v2 mounts to Solaris and
100 	 * Irix boxes work correctly. See description of
101 	 * sattr in section 6.1 of "NFS Illustrated" by
102 	 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
103 	 */
104 	*p++ = htonl(timep->tv_sec);
105 	*p++ = htonl(1000000);
106 	return p;
107 }
108 
109 static inline __be32*
110 xdr_decode_time(__be32 *p, struct timespec *timep)
111 {
112 	timep->tv_sec = ntohl(*p++);
113 	/* Convert microseconds into nanoseconds */
114 	timep->tv_nsec = ntohl(*p++) * 1000;
115 	return p;
116 }
117 
118 static __be32 *
119 xdr_decode_fattr(__be32 *p, struct nfs_fattr *fattr)
120 {
121 	u32 rdev, type;
122 	type = ntohl(*p++);
123 	fattr->mode = ntohl(*p++);
124 	fattr->nlink = ntohl(*p++);
125 	fattr->uid = ntohl(*p++);
126 	fattr->gid = ntohl(*p++);
127 	fattr->size = ntohl(*p++);
128 	fattr->du.nfs2.blocksize = ntohl(*p++);
129 	rdev = ntohl(*p++);
130 	fattr->du.nfs2.blocks = ntohl(*p++);
131 	fattr->fsid.major = ntohl(*p++);
132 	fattr->fsid.minor = 0;
133 	fattr->fileid = ntohl(*p++);
134 	p = xdr_decode_time(p, &fattr->atime);
135 	p = xdr_decode_time(p, &fattr->mtime);
136 	p = xdr_decode_time(p, &fattr->ctime);
137 	fattr->valid |= NFS_ATTR_FATTR_V2;
138 	fattr->rdev = new_decode_dev(rdev);
139 	if (type == NFCHR && rdev == NFS2_FIFO_DEV) {
140 		fattr->mode = (fattr->mode & ~S_IFMT) | S_IFIFO;
141 		fattr->rdev = 0;
142 	}
143 	return p;
144 }
145 
146 static inline __be32 *
147 xdr_encode_sattr(__be32 *p, struct iattr *attr)
148 {
149 	const __be32 not_set = __constant_htonl(0xFFFFFFFF);
150 
151 	*p++ = (attr->ia_valid & ATTR_MODE) ? htonl(attr->ia_mode) : not_set;
152 	*p++ = (attr->ia_valid & ATTR_UID) ? htonl(attr->ia_uid) : not_set;
153 	*p++ = (attr->ia_valid & ATTR_GID) ? htonl(attr->ia_gid) : not_set;
154 	*p++ = (attr->ia_valid & ATTR_SIZE) ? htonl(attr->ia_size) : not_set;
155 
156 	if (attr->ia_valid & ATTR_ATIME_SET) {
157 		p = xdr_encode_time(p, &attr->ia_atime);
158 	} else if (attr->ia_valid & ATTR_ATIME) {
159 		p = xdr_encode_current_server_time(p, &attr->ia_atime);
160 	} else {
161 		*p++ = not_set;
162 		*p++ = not_set;
163 	}
164 
165 	if (attr->ia_valid & ATTR_MTIME_SET) {
166 		p = xdr_encode_time(p, &attr->ia_mtime);
167 	} else if (attr->ia_valid & ATTR_MTIME) {
168 		p = xdr_encode_current_server_time(p, &attr->ia_mtime);
169 	} else {
170 		*p++ = not_set;
171 		*p++ = not_set;
172 	}
173   	return p;
174 }
175 
176 /*
177  * NFS encode functions
178  */
179 /*
180  * Encode file handle argument
181  * GETATTR, READLINK, STATFS
182  */
183 static int
184 nfs_xdr_fhandle(struct rpc_rqst *req, __be32 *p, struct nfs_fh *fh)
185 {
186 	p = xdr_encode_fhandle(p, fh);
187 	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
188 	return 0;
189 }
190 
191 /*
192  * Encode SETATTR arguments
193  */
194 static int
195 nfs_xdr_sattrargs(struct rpc_rqst *req, __be32 *p, struct nfs_sattrargs *args)
196 {
197 	p = xdr_encode_fhandle(p, args->fh);
198 	p = xdr_encode_sattr(p, args->sattr);
199 	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
200 	return 0;
201 }
202 
203 /*
204  * Encode directory ops argument
205  * LOOKUP, RMDIR
206  */
207 static int
208 nfs_xdr_diropargs(struct rpc_rqst *req, __be32 *p, struct nfs_diropargs *args)
209 {
210 	p = xdr_encode_fhandle(p, args->fh);
211 	p = xdr_encode_array(p, args->name, args->len);
212 	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
213 	return 0;
214 }
215 
216 /*
217  * Encode REMOVE argument
218  */
219 static int
220 nfs_xdr_removeargs(struct rpc_rqst *req, __be32 *p, const struct nfs_removeargs *args)
221 {
222 	p = xdr_encode_fhandle(p, args->fh);
223 	p = xdr_encode_array(p, args->name.name, args->name.len);
224 	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
225 	return 0;
226 }
227 
228 /*
229  * Arguments to a READ call. Since we read data directly into the page
230  * cache, we also set up the reply iovec here so that iov[1] points
231  * exactly to the page we want to fetch.
232  */
233 static int
234 nfs_xdr_readargs(struct rpc_rqst *req, __be32 *p, struct nfs_readargs *args)
235 {
236 	struct rpc_auth	*auth = req->rq_cred->cr_auth;
237 	unsigned int replen;
238 	u32 offset = (u32)args->offset;
239 	u32 count = args->count;
240 
241 	p = xdr_encode_fhandle(p, args->fh);
242 	*p++ = htonl(offset);
243 	*p++ = htonl(count);
244 	*p++ = htonl(count);
245 	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
246 
247 	/* Inline the page array */
248 	replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS_readres_sz) << 2;
249 	xdr_inline_pages(&req->rq_rcv_buf, replen,
250 			 args->pages, args->pgbase, count);
251 	req->rq_rcv_buf.flags |= XDRBUF_READ;
252 	return 0;
253 }
254 
255 /*
256  * Decode READ reply
257  */
258 static int
259 nfs_xdr_readres(struct rpc_rqst *req, __be32 *p, struct nfs_readres *res)
260 {
261 	struct kvec *iov = req->rq_rcv_buf.head;
262 	size_t hdrlen;
263 	u32 count, recvd;
264 	int status;
265 
266 	if ((status = ntohl(*p++)))
267 		return nfs_stat_to_errno(status);
268 	p = xdr_decode_fattr(p, res->fattr);
269 
270 	count = ntohl(*p++);
271 	res->eof = 0;
272 	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
273 	if (iov->iov_len < hdrlen) {
274 		dprintk("NFS: READ reply header overflowed:"
275 				"length %Zu > %Zu\n", hdrlen, iov->iov_len);
276 		return -errno_NFSERR_IO;
277 	} else if (iov->iov_len != hdrlen) {
278 		dprintk("NFS: READ header is short. iovec will be shifted.\n");
279 		xdr_shift_buf(&req->rq_rcv_buf, iov->iov_len - hdrlen);
280 	}
281 
282 	recvd = req->rq_rcv_buf.len - hdrlen;
283 	if (count > recvd) {
284 		dprintk("NFS: server cheating in read reply: "
285 			"count %u > recvd %u\n", count, recvd);
286 		count = recvd;
287 	}
288 
289 	dprintk("RPC:      readres OK count %u\n", count);
290 	if (count < res->count)
291 		res->count = count;
292 
293 	return count;
294 }
295 
296 
297 /*
298  * Write arguments. Splice the buffer to be written into the iovec.
299  */
300 static int
301 nfs_xdr_writeargs(struct rpc_rqst *req, __be32 *p, struct nfs_writeargs *args)
302 {
303 	struct xdr_buf *sndbuf = &req->rq_snd_buf;
304 	u32 offset = (u32)args->offset;
305 	u32 count = args->count;
306 
307 	p = xdr_encode_fhandle(p, args->fh);
308 	*p++ = htonl(offset);
309 	*p++ = htonl(offset);
310 	*p++ = htonl(count);
311 	*p++ = htonl(count);
312 	sndbuf->len = xdr_adjust_iovec(sndbuf->head, p);
313 
314 	/* Copy the page array */
315 	xdr_encode_pages(sndbuf, args->pages, args->pgbase, count);
316 	sndbuf->flags |= XDRBUF_WRITE;
317 	return 0;
318 }
319 
320 /*
321  * Encode create arguments
322  * CREATE, MKDIR
323  */
324 static int
325 nfs_xdr_createargs(struct rpc_rqst *req, __be32 *p, struct nfs_createargs *args)
326 {
327 	p = xdr_encode_fhandle(p, args->fh);
328 	p = xdr_encode_array(p, args->name, args->len);
329 	p = xdr_encode_sattr(p, args->sattr);
330 	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
331 	return 0;
332 }
333 
334 /*
335  * Encode RENAME arguments
336  */
337 static int
338 nfs_xdr_renameargs(struct rpc_rqst *req, __be32 *p, struct nfs_renameargs *args)
339 {
340 	p = xdr_encode_fhandle(p, args->old_dir);
341 	p = xdr_encode_array(p, args->old_name->name, args->old_name->len);
342 	p = xdr_encode_fhandle(p, args->new_dir);
343 	p = xdr_encode_array(p, args->new_name->name, args->new_name->len);
344 	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
345 	return 0;
346 }
347 
348 /*
349  * Encode LINK arguments
350  */
351 static int
352 nfs_xdr_linkargs(struct rpc_rqst *req, __be32 *p, struct nfs_linkargs *args)
353 {
354 	p = xdr_encode_fhandle(p, args->fromfh);
355 	p = xdr_encode_fhandle(p, args->tofh);
356 	p = xdr_encode_array(p, args->toname, args->tolen);
357 	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
358 	return 0;
359 }
360 
361 /*
362  * Encode SYMLINK arguments
363  */
364 static int
365 nfs_xdr_symlinkargs(struct rpc_rqst *req, __be32 *p, struct nfs_symlinkargs *args)
366 {
367 	struct xdr_buf *sndbuf = &req->rq_snd_buf;
368 	size_t pad;
369 
370 	p = xdr_encode_fhandle(p, args->fromfh);
371 	p = xdr_encode_array(p, args->fromname, args->fromlen);
372 	*p++ = htonl(args->pathlen);
373 	sndbuf->len = xdr_adjust_iovec(sndbuf->head, p);
374 
375 	xdr_encode_pages(sndbuf, args->pages, 0, args->pathlen);
376 
377 	/*
378 	 * xdr_encode_pages may have added a few bytes to ensure the
379 	 * pathname ends on a 4-byte boundary.  Start encoding the
380 	 * attributes after the pad bytes.
381 	 */
382 	pad = sndbuf->tail->iov_len;
383 	if (pad > 0)
384 		p++;
385 	p = xdr_encode_sattr(p, args->sattr);
386 	sndbuf->len += xdr_adjust_iovec(sndbuf->tail, p) - pad;
387 	return 0;
388 }
389 
390 /*
391  * Encode arguments to readdir call
392  */
393 static int
394 nfs_xdr_readdirargs(struct rpc_rqst *req, __be32 *p, struct nfs_readdirargs *args)
395 {
396 	struct rpc_auth	*auth = req->rq_cred->cr_auth;
397 	unsigned int replen;
398 	u32 count = args->count;
399 
400 	p = xdr_encode_fhandle(p, args->fh);
401 	*p++ = htonl(args->cookie);
402 	*p++ = htonl(count); /* see above */
403 	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
404 
405 	/* Inline the page array */
406 	replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS_readdirres_sz) << 2;
407 	xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, 0, count);
408 	return 0;
409 }
410 
411 /*
412  * Decode the result of a readdir call.
413  * We're not really decoding anymore, we just leave the buffer untouched
414  * and only check that it is syntactically correct.
415  * The real decoding happens in nfs_decode_entry below, called directly
416  * from nfs_readdir for each entry.
417  */
418 static int
419 nfs_xdr_readdirres(struct rpc_rqst *req, __be32 *p, void *dummy)
420 {
421 	struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
422 	struct kvec *iov = rcvbuf->head;
423 	struct page **page;
424 	size_t hdrlen;
425 	unsigned int pglen, recvd;
426 	int status;
427 
428 	if ((status = ntohl(*p++)))
429 		return nfs_stat_to_errno(status);
430 
431 	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
432 	if (iov->iov_len < hdrlen) {
433 		dprintk("NFS: READDIR reply header overflowed:"
434 				"length %Zu > %Zu\n", hdrlen, iov->iov_len);
435 		return -errno_NFSERR_IO;
436 	} else if (iov->iov_len != hdrlen) {
437 		dprintk("NFS: READDIR header is short. iovec will be shifted.\n");
438 		xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
439 	}
440 
441 	pglen = rcvbuf->page_len;
442 	recvd = rcvbuf->len - hdrlen;
443 	if (pglen > recvd)
444 		pglen = recvd;
445 	page = rcvbuf->pages;
446 	return pglen;
447 }
448 
449 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
450 {
451 	dprintk("nfs: %s: prematurely hit end of receive buffer. "
452 		"Remaining buffer length is %tu words.\n",
453 		func, xdr->end - xdr->p);
454 }
455 
456 __be32 *
457 nfs_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry, struct nfs_server *server, int plus)
458 {
459 	__be32 *p;
460 	p = xdr_inline_decode(xdr, 4);
461 	if (unlikely(!p))
462 		goto out_overflow;
463 	if (!ntohl(*p++)) {
464 		p = xdr_inline_decode(xdr, 4);
465 		if (unlikely(!p))
466 			goto out_overflow;
467 		if (!ntohl(*p++))
468 			return ERR_PTR(-EAGAIN);
469 		entry->eof = 1;
470 		return ERR_PTR(-EBADCOOKIE);
471 	}
472 
473 	p = xdr_inline_decode(xdr, 8);
474 	if (unlikely(!p))
475 		goto out_overflow;
476 
477 	entry->ino	  = ntohl(*p++);
478 	entry->len	  = ntohl(*p++);
479 
480 	p = xdr_inline_decode(xdr, entry->len + 4);
481 	if (unlikely(!p))
482 		goto out_overflow;
483 	entry->name	  = (const char *) p;
484 	p		 += XDR_QUADLEN(entry->len);
485 	entry->prev_cookie	  = entry->cookie;
486 	entry->cookie	  = ntohl(*p++);
487 
488 	entry->d_type = DT_UNKNOWN;
489 
490 	return p;
491 
492 out_overflow:
493 	print_overflow_msg(__func__, xdr);
494 	return ERR_PTR(-EAGAIN);
495 }
496 
497 /*
498  * NFS XDR decode functions
499  */
500 /*
501  * Decode simple status reply
502  */
503 static int
504 nfs_xdr_stat(struct rpc_rqst *req, __be32 *p, void *dummy)
505 {
506 	int	status;
507 
508 	if ((status = ntohl(*p++)) != 0)
509 		status = nfs_stat_to_errno(status);
510 	return status;
511 }
512 
513 /*
514  * Decode attrstat reply
515  * GETATTR, SETATTR, WRITE
516  */
517 static int
518 nfs_xdr_attrstat(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
519 {
520 	int	status;
521 
522 	if ((status = ntohl(*p++)))
523 		return nfs_stat_to_errno(status);
524 	xdr_decode_fattr(p, fattr);
525 	return 0;
526 }
527 
528 /*
529  * Decode diropres reply
530  * LOOKUP, CREATE, MKDIR
531  */
532 static int
533 nfs_xdr_diropres(struct rpc_rqst *req, __be32 *p, struct nfs_diropok *res)
534 {
535 	int	status;
536 
537 	if ((status = ntohl(*p++)))
538 		return nfs_stat_to_errno(status);
539 	p = xdr_decode_fhandle(p, res->fh);
540 	xdr_decode_fattr(p, res->fattr);
541 	return 0;
542 }
543 
544 /*
545  * Encode READLINK args
546  */
547 static int
548 nfs_xdr_readlinkargs(struct rpc_rqst *req, __be32 *p, struct nfs_readlinkargs *args)
549 {
550 	struct rpc_auth	*auth = req->rq_cred->cr_auth;
551 	unsigned int replen;
552 
553 	p = xdr_encode_fhandle(p, args->fh);
554 	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
555 
556 	/* Inline the page array */
557 	replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS_readlinkres_sz) << 2;
558 	xdr_inline_pages(&req->rq_rcv_buf, replen, args->pages, args->pgbase, args->pglen);
559 	return 0;
560 }
561 
562 /*
563  * Decode READLINK reply
564  */
565 static int
566 nfs_xdr_readlinkres(struct rpc_rqst *req, __be32 *p, void *dummy)
567 {
568 	struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
569 	struct kvec *iov = rcvbuf->head;
570 	size_t hdrlen;
571 	u32 len, recvd;
572 	int	status;
573 
574 	if ((status = ntohl(*p++)))
575 		return nfs_stat_to_errno(status);
576 	/* Convert length of symlink */
577 	len = ntohl(*p++);
578 	if (len >= rcvbuf->page_len) {
579 		dprintk("nfs: server returned giant symlink!\n");
580 		return -ENAMETOOLONG;
581 	}
582 	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
583 	if (iov->iov_len < hdrlen) {
584 		dprintk("NFS: READLINK reply header overflowed:"
585 				"length %Zu > %Zu\n", hdrlen, iov->iov_len);
586 		return -errno_NFSERR_IO;
587 	} else if (iov->iov_len != hdrlen) {
588 		dprintk("NFS: READLINK header is short. iovec will be shifted.\n");
589 		xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
590 	}
591 	recvd = req->rq_rcv_buf.len - hdrlen;
592 	if (recvd < len) {
593 		dprintk("NFS: server cheating in readlink reply: "
594 				"count %u > recvd %u\n", len, recvd);
595 		return -EIO;
596 	}
597 
598 	xdr_terminate_string(rcvbuf, len);
599 	return 0;
600 }
601 
602 /*
603  * Decode WRITE reply
604  */
605 static int
606 nfs_xdr_writeres(struct rpc_rqst *req, __be32 *p, struct nfs_writeres *res)
607 {
608 	res->verf->committed = NFS_FILE_SYNC;
609 	return nfs_xdr_attrstat(req, p, res->fattr);
610 }
611 
612 /*
613  * Decode STATFS reply
614  */
615 static int
616 nfs_xdr_statfsres(struct rpc_rqst *req, __be32 *p, struct nfs2_fsstat *res)
617 {
618 	int	status;
619 
620 	if ((status = ntohl(*p++)))
621 		return nfs_stat_to_errno(status);
622 
623 	res->tsize  = ntohl(*p++);
624 	res->bsize  = ntohl(*p++);
625 	res->blocks = ntohl(*p++);
626 	res->bfree  = ntohl(*p++);
627 	res->bavail = ntohl(*p++);
628 	return 0;
629 }
630 
631 /*
632  * We need to translate between nfs status return values and
633  * the local errno values which may not be the same.
634  */
635 static struct {
636 	int stat;
637 	int errno;
638 } nfs_errtbl[] = {
639 	{ NFS_OK,		0		},
640 	{ NFSERR_PERM,		-EPERM		},
641 	{ NFSERR_NOENT,		-ENOENT		},
642 	{ NFSERR_IO,		-errno_NFSERR_IO},
643 	{ NFSERR_NXIO,		-ENXIO		},
644 /*	{ NFSERR_EAGAIN,	-EAGAIN		}, */
645 	{ NFSERR_ACCES,		-EACCES		},
646 	{ NFSERR_EXIST,		-EEXIST		},
647 	{ NFSERR_XDEV,		-EXDEV		},
648 	{ NFSERR_NODEV,		-ENODEV		},
649 	{ NFSERR_NOTDIR,	-ENOTDIR	},
650 	{ NFSERR_ISDIR,		-EISDIR		},
651 	{ NFSERR_INVAL,		-EINVAL		},
652 	{ NFSERR_FBIG,		-EFBIG		},
653 	{ NFSERR_NOSPC,		-ENOSPC		},
654 	{ NFSERR_ROFS,		-EROFS		},
655 	{ NFSERR_MLINK,		-EMLINK		},
656 	{ NFSERR_NAMETOOLONG,	-ENAMETOOLONG	},
657 	{ NFSERR_NOTEMPTY,	-ENOTEMPTY	},
658 	{ NFSERR_DQUOT,		-EDQUOT		},
659 	{ NFSERR_STALE,		-ESTALE		},
660 	{ NFSERR_REMOTE,	-EREMOTE	},
661 #ifdef EWFLUSH
662 	{ NFSERR_WFLUSH,	-EWFLUSH	},
663 #endif
664 	{ NFSERR_BADHANDLE,	-EBADHANDLE	},
665 	{ NFSERR_NOT_SYNC,	-ENOTSYNC	},
666 	{ NFSERR_BAD_COOKIE,	-EBADCOOKIE	},
667 	{ NFSERR_NOTSUPP,	-ENOTSUPP	},
668 	{ NFSERR_TOOSMALL,	-ETOOSMALL	},
669 	{ NFSERR_SERVERFAULT,	-EREMOTEIO	},
670 	{ NFSERR_BADTYPE,	-EBADTYPE	},
671 	{ NFSERR_JUKEBOX,	-EJUKEBOX	},
672 	{ -1,			-EIO		}
673 };
674 
675 /*
676  * Convert an NFS error code to a local one.
677  * This one is used jointly by NFSv2 and NFSv3.
678  */
679 int
680 nfs_stat_to_errno(int stat)
681 {
682 	int i;
683 
684 	for (i = 0; nfs_errtbl[i].stat != -1; i++) {
685 		if (nfs_errtbl[i].stat == stat)
686 			return nfs_errtbl[i].errno;
687 	}
688 	dprintk("nfs_stat_to_errno: bad nfs status return value: %d\n", stat);
689 	return nfs_errtbl[i].errno;
690 }
691 
692 #define PROC(proc, argtype, restype, timer)				\
693 [NFSPROC_##proc] = {							\
694 	.p_proc	    =  NFSPROC_##proc,					\
695 	.p_encode   =  (kxdrproc_t) nfs_xdr_##argtype,			\
696 	.p_decode   =  (kxdrproc_t) nfs_xdr_##restype,			\
697 	.p_arglen   =  NFS_##argtype##_sz,				\
698 	.p_replen   =  NFS_##restype##_sz,				\
699 	.p_timer    =  timer,						\
700 	.p_statidx  =  NFSPROC_##proc,					\
701 	.p_name     =  #proc,						\
702 	}
703 struct rpc_procinfo	nfs_procedures[] = {
704     PROC(GETATTR,	fhandle,	attrstat, 1),
705     PROC(SETATTR,	sattrargs,	attrstat, 0),
706     PROC(LOOKUP,	diropargs,	diropres, 2),
707     PROC(READLINK,	readlinkargs,	readlinkres, 3),
708     PROC(READ,		readargs,	readres, 3),
709     PROC(WRITE,		writeargs,	writeres, 4),
710     PROC(CREATE,	createargs,	diropres, 0),
711     PROC(REMOVE,	removeargs,	stat, 0),
712     PROC(RENAME,	renameargs,	stat, 0),
713     PROC(LINK,		linkargs,	stat, 0),
714     PROC(SYMLINK,	symlinkargs,	stat, 0),
715     PROC(MKDIR,		createargs,	diropres, 0),
716     PROC(RMDIR,		diropargs,	stat, 0),
717     PROC(READDIR,	readdirargs,	readdirres, 3),
718     PROC(STATFS,	fhandle,	statfsres, 0),
719 };
720 
721 struct rpc_version		nfs_version2 = {
722 	.number			= 2,
723 	.nrprocs		= ARRAY_SIZE(nfs_procedures),
724 	.procs			= nfs_procedures
725 };
726